91849381 has 8 divisors (see below), whose sum is σ = 99349880. Its totient is φ = 84411072.

The previous prime is 91849379. The next prime is 91849399. The reversal of 91849381 is 18394819.

It can be written as a sum of positive squares in 4 ways, for example, as 4800481 + 87048900 = 2191^2 + 9330^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 91849381 - 2¹ = 91849379 is a prime.

It is a super-2 number, since 2×91849381² = 16872617580166322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91849361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12450 + ... + 18403.

It is an arithmetic number, because the mean of its divisors is an integer number (12418735).

Almost surely, 2^91849381 is an apocalyptic number.

It is an amenable number.

91849381 is a deficient number, since it is larger than the sum of its proper divisors (7500499).

91849381 is a wasteful number, since it uses less digits than its factorization.

91849381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31095.

The product of its digits is 62208, while the sum is 43.

The square root of 91849381 is about 9583.8082722893. The cubic root of 91849381 is about 451.1892510103.

The spelling of 91849381 in words is "ninety-one million, eight hundred forty-nine thousand, three hundred eighty-one".